1) People wear facemasks to prevent Covid- 19
-> Facemasks are worn to prevent Covid-19.
2) "How much time a day do you spend on studying online, Minh?" said Hoang.
-> Hoang asked Minh how much time a day he spent on studying online.
Facemasks are worn to prevent Covid-19
Hoang asked Minh how much time a day he spent on studying online